This was my dads car before it was mine, and he drove around with the SES light on for about two years because the mechanic said it wouldn't hurt anything . About a month ago I decided to get it fixed and they replaced the cam sensor and synchronizer. Got it home, then the next day the light come back on so i took it back and they said it was the erg valve, so I had them fix it, they gave me two parts but I am not sure what they were. It was fine for about 3 weeks then that stupid light came back on, took it to Autozone and they scanned it and it said the catalytic converter was bad. Does it seem weird that I am having these problem after I had the cam sensor and synchronizer fixed?